Long-Afterglow Materials Enabled by the Confinement Effect of Cellulose Nanocrystals Cholesteric Liquid Crystals.

IF 3.6 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Chemistry - A European Journal Pub Date : 2026-10-15 DOI:10.1002/chem.71808

Sichen Meng, Shengwen Bao, Danfeng Ye, Sheng He, Zaiyuan Lin, Shuaishuai Lu, Deli Sun, Ying Liu, Liangliang Zhu

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Abstract

Room-temperature phosphorescence (RTP) is highly sought after for optical sensing and encryption, but is constrained by triplet exciton quenching. This challenge is addressed by employing cellulose nanocrystals (CNC), specifically carboxylated CNC, as a cholesteric host and coronene tetracarboxylate (CS) as a phosphorescent guest. The self-assembled CNC matrix provides a rigid, anisotropic microenvironment through nanorod ordering and hydrogen bonding with CS, effectively suppressing non-radiative relaxation. Systematic CS loading (0.3-5 wt%) reveals optimal performance at 1 wt% (lifetime: 1.756 s, quantum yield: 9.4%, 8 s afterglow), while higher loadings disrupt ordering and induce aggregation quenching. Three application strategies are further demonstrated: doping-contrast Morse coding, water/thermal rewritable patterns, and Rhodamine B-mediated multicolor time-sequenced luminescence. Collectively, these results show that CNC cholesteric order actively enhances RTP, establishing these biocomposite films as viable materials for advanced anti-counterfeiting and encryption systems.

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纤维素纳米晶胆甾体液晶约束作用下的长余辉材料。

室温磷光（RTP）在光学传感和加密领域备受追捧，但受到三重态激子猝灭的限制。这一挑战是通过使用纤维素纳米晶体（CNC），特别是羧化的CNC，作为胆固醇酯宿主和冠烯四羧酸酯（CS）作为磷光客体来解决的。自组装的CNC矩阵通过纳米棒有序和CS的氢键提供了一个刚性的、各向异性的微环境，有效地抑制了非辐射弛豫。系统CS负载（0.3-5 wt%）在1 wt%（寿命：1.756 s，量子产率：9.4%，余辉8 s）时显示最佳性能，而更高的负载会破坏有序并导致聚集猝灭。进一步论证了三种应用策略：掺杂对比莫尔斯编码、水/热可重写模式和罗丹明b介导的多色时序发光。综上所述，这些结果表明CNC胆甾酯序能有效地增强RTP，使这些生物复合膜成为先进防伪和加密系统的可行材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemistry - A European Journal 化学-化学综合

CiteScore

7.90

自引率

4.70%

发文量

1808

审稿时长

1.8 months

期刊介绍： Chemistry—A European Journal is a truly international journal with top quality contributions (2018 ISI Impact Factor: 5.16). It publishes a wide range of outstanding Reviews, Minireviews, Concepts, Full Papers, and Communications from all areas of chemistry and related fields. Based in Europe Chemistry—A European Journal provides an excellent platform for increasing the visibility of European chemistry as well as for featuring the best research from authors from around the world. All manuscripts are peer-reviewed, and electronic processing ensures accurate reproduction of text and data, plus short publication times. The Concepts section provides nonspecialist readers with a useful conceptual guide to unfamiliar areas and experts with new angles on familiar problems. Chemistry—A European Journal is published on behalf of ChemPubSoc Europe, a group of 16 national chemical societies from within Europe, and supported by the Asian Chemical Editorial Societies. The ChemPubSoc Europe family comprises: Angewandte Chemie, Chemistry—A European Journal, European Journal of Organic Chemistry, European Journal of Inorganic Chemistry, ChemPhysChem, ChemBioChem, ChemMedChem, ChemCatChem, ChemSusChem, ChemPlusChem, ChemElectroChem, and ChemistryOpen.